Set event to JList

I have developed java application in netbeans IDE. I am using JList for my application. And I have 5 combobox on same frame. When I select number of combobox, values of that are added in JList. And when I deselect same combobox which I selected previous, values of that are get remove from JList.
I want to set event to JList so that I get count of items of JList each time when I add and removed item. I want to fire event without touching it or without grabbing focus. I also want to do some operations on same event.
So which event I should use? Please help
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You can use ItemListnere event
and define itemStateChanged(ItemEvent e) method
You add ItemListener to each of your comboboxes and then
you check when item state changes and on which combo box

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You should already have the ability to do this: if you are changing the JList depending on the selection/deselection of an item in the combo box then you must be using some sort of listener, in which you're determining how many items the JList is going to hold. I don't see the need for an extra event.

If you're determined to have one for some reason then you can create a custom event:

or look at

which is already a JList that responds to changes in its data
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